package com.mmall.util;

import java.math.BigDecimal;

/**
 * @Author 侯俊杰
 * @Date 2017/12/5
 * @Time 10:33
 **/
public class BigDecimalUtil
{
    private BigDecimalUtil()
    {

    }

    //不会丢失精度的四则运算
    public static BigDecimal add(double v1,double v2)
    {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.add(b2);
    }

    public static BigDecimal sub(double v1,double v2)
    {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.subtract(b2);
    }

    public static BigDecimal mul(double v1,double v2)
    {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.multiply(b2);
    }

    public static BigDecimal div(double v1,double v2)
    {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));

        //除不尽的处理:四舍五入，保留两位小数
        return b1.divide(b2,2,BigDecimal.ROUND_HALF_UP);

    }
}
